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209 lines
11 KiB
C
209 lines
11 KiB
C
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/*============================================================================
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This C header file is part of the SoftFloat IEEE Floating-Point Arithmetic
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Package, Release 3d, by John R. Hauser.
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Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
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California. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions, and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the University nor the names of its contributors may
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be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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=============================================================================*/
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#ifndef specialize_h
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#define specialize_h 1
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#include <stdbool.h>
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#include <stdint.h>
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#include "softfloat_types.h"
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/*----------------------------------------------------------------------------
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| Default value for `softfloat_detectTininess'.
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*----------------------------------------------------------------------------*/
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#define init_detectTininess softfloat_tininess_afterRounding
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/*----------------------------------------------------------------------------
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| The values to return on conversions to 32-bit integer formats that raise an
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| invalid exception.
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*----------------------------------------------------------------------------*/
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#define ui32_fromPosOverflow 0xFFFFFFFF
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#define ui32_fromNegOverflow 0
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#define ui32_fromNaN 0xFFFFFFFF
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#define i32_fromPosOverflow 0x7FFFFFFF
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#define i32_fromNegOverflow (-0x7FFFFFFF - 1)
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#define i32_fromNaN 0x7FFFFFFF
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/*----------------------------------------------------------------------------
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| The values to return on conversions to 64-bit integer formats that raise an
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| invalid exception.
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*----------------------------------------------------------------------------*/
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#define ui64_fromPosOverflow UINT64_C( 0xFFFFFFFFFFFFFFFF )
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#define ui64_fromNegOverflow 0
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#define ui64_fromNaN UINT64_C( 0xFFFFFFFFFFFFFFFF )
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#define i64_fromPosOverflow UINT64_C( 0x7FFFFFFFFFFFFFFF )
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#define i64_fromNegOverflow (-UINT64_C( 0x7FFFFFFFFFFFFFFF ) - 1)
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#define i64_fromNaN UINT64_C( 0x7FFFFFFFFFFFFFFF )
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/*----------------------------------------------------------------------------
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| "Common NaN" structure, used to transfer NaN representations from one format
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| to another.
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*----------------------------------------------------------------------------*/
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struct commonNaN {
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bool sign;
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#ifdef LITTLEENDIAN
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uint64_t v0, v64;
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#else
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uint64_t v64, v0;
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#endif
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};
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 16-bit floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNF16UI 0xFE00
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/*----------------------------------------------------------------------------
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| Returns true when 16-bit unsigned integer `uiA' has the bit pattern of a
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| 16-bit floating-point signaling NaN.
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| Note: This macro evaluates its argument more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNF16UI( uiA ) ((((uiA) & 0x7E00) == 0x7C00) && ((uiA) & 0x01FF))
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by `aPtr' into a 16-bit floating-point
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| NaN, and returns the bit pattern of this value as an unsigned integer.
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*----------------------------------------------------------------------------*/
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uint_fast16_t softfloat_commonNaNToF16UI( const struct commonNaN *aPtr );
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 32-bit floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNF32UI 0xFFC00000
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/*----------------------------------------------------------------------------
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| Returns true when 32-bit unsigned integer `uiA' has the bit pattern of a
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| 32-bit floating-point signaling NaN.
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| Note: This macro evaluates its argument more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNF32UI( uiA ) ((((uiA) & 0x7FC00000) == 0x7F800000) && ((uiA) & 0x003FFFFF))
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/*----------------------------------------------------------------------------
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| Assuming `uiA' has the bit pattern of a 32-bit floating-point NaN, converts
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| this NaN to the common NaN form, and stores the resulting common NaN at the
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| location pointed to by `zPtr'. If the NaN is a signaling NaN, the invalid
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| exception is raised.
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*----------------------------------------------------------------------------*/
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void softfloat_f32UIToCommonNaN( uint_fast32_t uiA, struct commonNaN *zPtr );
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by `aPtr' into a 32-bit floating-point
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| NaN, and returns the bit pattern of this value as an unsigned integer.
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*----------------------------------------------------------------------------*/
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uint_fast32_t softfloat_commonNaNToF32UI( const struct commonNaN *aPtr );
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/*----------------------------------------------------------------------------
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| Interpreting `uiA' and `uiB' as the bit patterns of two 32-bit floating-
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| point values, at least one of which is a NaN, returns the bit pattern of
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| the combined NaN result. If either `uiA' or `uiB' has the pattern of a
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| signaling NaN, the invalid exception is raised.
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*----------------------------------------------------------------------------*/
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uint_fast32_t
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softfloat_propagateNaNF32UI( uint_fast32_t uiA, uint_fast32_t uiB );
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 64-bit floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNF64UI UINT64_C( 0xFFF8000000000000 )
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/*----------------------------------------------------------------------------
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| Returns true when 64-bit unsigned integer `uiA' has the bit pattern of a
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| 64-bit floating-point signaling NaN.
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| Note: This macro evaluates its argument more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNF64UI( uiA ) ((((uiA) & UINT64_C( 0x7FF8000000000000 )) == UINT64_C( 0x7FF0000000000000 )) && ((uiA) & UINT64_C( 0x0007FFFFFFFFFFFF )))
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/*----------------------------------------------------------------------------
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| Assuming `uiA' has the bit pattern of a 64-bit floating-point NaN, converts
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| this NaN to the common NaN form, and stores the resulting common NaN at the
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| location pointed to by `zPtr'. If the NaN is a signaling NaN, the invalid
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| exception is raised.
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*----------------------------------------------------------------------------*/
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void softfloat_f64UIToCommonNaN( uint_fast64_t uiA, struct commonNaN *zPtr );
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/*----------------------------------------------------------------------------
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| Converts the common NaN pointed to by `aPtr' into a 64-bit floating-point
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| NaN, and returns the bit pattern of this value as an unsigned integer.
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*----------------------------------------------------------------------------*/
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uint_fast64_t softfloat_commonNaNToF64UI( const struct commonNaN *aPtr );
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/*----------------------------------------------------------------------------
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| Interpreting `uiA' and `uiB' as the bit patterns of two 64-bit floating-
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| point values, at least one of which is a NaN, returns the bit pattern of
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| the combined NaN result. If either `uiA' or `uiB' has the pattern of a
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| signaling NaN, the invalid exception is raised.
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*----------------------------------------------------------------------------*/
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uint_fast64_t
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softfloat_propagateNaNF64UI( uint_fast64_t uiA, uint_fast64_t uiB );
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 80-bit extended floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNExtF80UI64 0xFFFF
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#define defaultNaNExtF80UI0 UINT64_C( 0xC000000000000000 )
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/*----------------------------------------------------------------------------
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| Returns true when the 80-bit unsigned integer formed from concatenating
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| 16-bit `uiA64' and 64-bit `uiA0' has the bit pattern of an 80-bit extended
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| floating-point signaling NaN.
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| Note: This macro evaluates its arguments more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNExtF80UI( uiA64, uiA0 ) ((((uiA64) & 0x7FFF) == 0x7FFF) && ! ((uiA0) & UINT64_C( 0x4000000000000000 )) && ((uiA0) & UINT64_C( 0x3FFFFFFFFFFFFFFF )))
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/*----------------------------------------------------------------------------
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| The following functions are needed only when `SOFTFLOAT_FAST_INT64' is
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| defined.
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*----------------------------------------------------------------------------*/
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/*----------------------------------------------------------------------------
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| The bit pattern for a default generated 128-bit floating-point NaN.
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*----------------------------------------------------------------------------*/
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#define defaultNaNF128UI64 UINT64_C( 0xFFFF800000000000 )
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#define defaultNaNF128UI0 UINT64_C( 0 )
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/*----------------------------------------------------------------------------
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| Returns true when the 128-bit unsigned integer formed from concatenating
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| 64-bit `uiA64' and 64-bit `uiA0' has the bit pattern of a 128-bit floating-
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| point signaling NaN.
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| Note: This macro evaluates its arguments more than once.
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*----------------------------------------------------------------------------*/
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#define softfloat_isSigNaNF128UI( uiA64, uiA0 ) ((((uiA64) & UINT64_C( 0x7FFF800000000000 )) == UINT64_C( 0x7FFF000000000000 )) && ((uiA0) || ((uiA64) & UINT64_C( 0x00007FFFFFFFFFFF ))))
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#endif
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